We need an update for Kayle and Morg on their background and story

I am so happy to see the new update of runeterra. However, I think Kayle and Morg's background need some update at this moment. Where are they from in this new map, and what is their role in this world? We have different races or powers in runeterra, and all of them have connection with each other except kayle and her sister. It makes me feel their story has been out of fashion at this moment, a Angel fight for justice and never show up during Noxus' Invasion or Shurima's collapse. Moreover, they never show up against the Void, and champions from Mount Targon seem to be more like protectors of this world. Of course, they never did something bad to this world. I played this games since Season 2 when Diana was just released, but i didn't see any champion from kayle's group any more, you know, every groups' background became more and more specific except these two lady with wings. It seems that Riot has forgotten them.